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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview Nav dot
* This is the class for the navigation controls that appear along the bottom
* of the NTP.
*/
cr.define('ntp', function() {
'use strict';
/**
* Creates a new navigation dot.
* @param {ntp.TilePage} page The associated TilePage.
* @param {string} title The title of the navigation dot.
* @param {boolean} titleIsEditable If true, the title can be changed.
* @param {boolean} animate If true, animates into existence.
* @constructor
* @extends {HTMLLIElement}
* @implements {cr.ui.DragWrapperDelegate}
*/
function NavDot(page, title, titleIsEditable, animate) {
const dot = /** @type {!NavDot} */ (document.createElement('li'));
dot.__proto__ = NavDot.prototype;
dot.initialize(page, title, titleIsEditable, animate);
return dot;
}
NavDot.prototype = {
__proto__: HTMLLIElement.prototype,
initialize: function(page, title, titleIsEditable, animate) {
this.className = 'dot';
this.setAttribute('role', 'button');
this.page_ = page;
const selectionBar = this.ownerDocument.createElement('div');
selectionBar.className = 'selection-bar';
this.appendChild(selectionBar);
// TODO(estade): should there be some limit to the number of characters?
this.input_ = this.ownerDocument.createElement('input');
this.input_.setAttribute('spellcheck', false);
this.input_.value = title;
// Take the input out of the tab-traversal focus order.
this.input_.disabled = true;
this.appendChild(this.input_);
this.displayTitle = title;
this.titleIsEditable_ = titleIsEditable;
this.addEventListener('keydown', this.onKeyDown_);
this.addEventListener('click', this.onClick_);
this.addEventListener('dblclick', this.onDoubleClick_);
this.dragWrapper_ = new cr.ui.DragWrapper(this, this);
this.addEventListener('transitionend', this.onTransitionEnd_);
this.input_.addEventListener('blur', this.onInputBlur_.bind(this));
this.input_.addEventListener(
'mousedown', this.onInputMouseDown_.bind(this));
this.input_.addEventListener('keydown', this.onInputKeyDown_.bind(this));
if (animate) {
this.classList.add('small');
const self = this;
window.setTimeout(function() {
self.classList.remove('small');
}, 0);
}
},
/**
* @return {ntp.TilePage} The associated TilePage.
*/
get page() {
return this.page_;
},
/**
* Sets/gets the display title.
* @type {string} title The display name for this nav dot.
*/
get displayTitle() {
return this.title;
},
set displayTitle(title) {
this.title = this.input_.value = title;
},
/**
* Removes the dot from the page. If |opt_animate| is truthy, we first
* transition the element to 0 width.
* @param {boolean=} opt_animate Whether to animate the removal or not.
*/
remove: function(opt_animate) {
if (opt_animate) {
this.classList.add('small');
} else {
this.parentNode.removeChild(this);
}
},
/**
* Navigates the card slider to the page for this dot.
*/
switchToPage: function() {
ntp.getCardSlider().selectCardByValue(this.page_, true);
},
/**
* Handler for keydown event on the dot.
* @param {Event} e The KeyboardEvent.
*/
onKeyDown_: function(e) {
if (e.key == 'Enter') {
this.onClick_(e);
e.stopPropagation();
}
},
/**
* Clicking causes the associated page to show.
* @param {Event} e The click event.
* @private
*/
onClick_: function(e) {
this.switchToPage();
// The explicit focus call is necessary because of overriding the default
// handling in onInputMouseDown_.
if (this.ownerDocument.activeElement != this.input_) {
this.focus();
}
e.stopPropagation();
},
/**
* Double clicks allow the user to edit the page title.
* @param {Event} e The click event.
* @private
*/
onDoubleClick_: function(e) {
if (this.titleIsEditable_) {
this.input_.disabled = false;
this.input_.focus();
this.input_.select();
}
},
/**
* Prevent mouse down on the input from selecting it.
* @param {Event} e The click event.
* @private
*/
onInputMouseDown_: function(e) {
if (this.ownerDocument.activeElement != this.input_) {
e.preventDefault();
}
},
/**
* Handle keypresses on the input.
* @param {Event} e The click event.
* @private
*/
onInputKeyDown_: function(e) {
switch (e.key) {
case 'Escape': // Escape cancels edits.
this.input_.value = this.displayTitle;
case 'Enter': // Fall through.
this.input_.blur();
break;
}
},
/**
* When the input blurs, commit the edited changes.
* @param {Event} e The blur event.
* @private
*/
onInputBlur_: function(e) {
window.getSelection().removeAllRanges();
this.displayTitle = this.input_.value;
ntp.saveAppPageName(this.page_, this.displayTitle);
this.input_.disabled = true;
},
shouldAcceptDrag: function(e) {
return this.page_.shouldAcceptDrag(e);
},
/** @override */
doDragEnter: function(e) {
const self = this;
function navPageClearTimeout() {
self.switchToPage();
self.dragNavTimeout = null;
}
this.dragNavTimeout = window.setTimeout(navPageClearTimeout, 500);
this.doDragOver(e);
},
/** @override */
doDragOver: function(e) {
// Prevent default handling so the <input> won't act as a drag target.
e.preventDefault();
if (!this.dragWrapper_.isCurrentDragTarget) {
ntp.setCurrentDropEffect(e.dataTransfer, 'none');
} else {
this.page_.setDropEffect(e.dataTransfer);
}
},
/** @override */
doDrop: function(e) {
e.stopPropagation();
const tile = ntp.getCurrentlyDraggingTile();
if (tile && tile.tilePage != this.page_) {
this.page_.appendDraggingTile();
}
// TODO(estade): handle non-tile drags.
this.cancelDelayedSwitch_();
},
/** @override */
doDragLeave: function(e) {
this.cancelDelayedSwitch_();
},
/**
* Cancels the timer for page switching.
* @private
*/
cancelDelayedSwitch_: function() {
if (this.dragNavTimeout) {
window.clearTimeout(this.dragNavTimeout);
this.dragNavTimeout = null;
}
},
/**
* A transition has ended.
* @param {Event} e The transition end event.
* @private
*/
onTransitionEnd_: function(e) {
if (e.propertyName === 'max-width' && this.classList.contains('small')) {
this.parentNode.removeChild(this);
}
},
};
return {
NavDot: NavDot,
};
});
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